Electromagnets are created by a. applying a charge to a magnetic material, wrapped in an insulator, which creates an electromagnetic field around the magnet. b. covering a magnet with insulation and applying an alternating electrical current to the magnet. c. twisting a ferromagnetic material, wrapping in an insulator, and applying a direct current to the coil. d. wrapping an insulated wire around a metal with ferromagnetic properties and applying an electric current.